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btrfs: dev-replace: remove custom read/write blocking scheme

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After the rw semaphore has been added, the custom blocking using
::blocking_readers and ::read_lock_wq is redundant.

The blocking logic in __btrfs_map_block is replaced by extending the
time the semaphore is held, that has the same blocking effect on writes
as the previous custom scheme that waited until ::blocking_readers was
zero.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2018-04-05 01:41:06 +02:00
parent 129827e300
commit 53176dde0a
5 changed files with 6 additions and 28 deletions
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2
fs/btrfs/disk-io.c
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@@ -2142,9 +2142,7 @@ static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
{
mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
init_rwsem(&fs_info->dev_replace.rwsem);
atomic_set(&fs_info->dev_replace.blocking_readers, 0);
init_waitqueue_head(&fs_info->dev_replace.replace_wait);
init_waitqueue_head(&fs_info->dev_replace.read_lock_wq);
}
static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)